//cursor

aliases: //cur

places the cursor item into your inventory, which allows you to set the corners of your selection by left and right clicking on blocks.

//1 <coords>
//2 <coords>

sets the corners of your selection to coords.

//movesel <coords>

moves your selection by coords.

//mask [shape]

masks your selection to fit into a specific shape.

//mask list

lists available shapes.

//selection

aliases: //sel

prints your selection coordinates in chat.

//set [filter] <pattern>

aliases: //replace

sets the selected region to the block pattern, optionally filtered by the block filter.

//undo
//redo

undoes or redoes any action that modifies blocks in the world.

//copy
//paste

copies and pastes your selection to and from your copy buffer.

//move <coords>

moves the selected region by coords, replacing the region it previously occupied with air.

//flip [axis=^]

flips the selected region along axis.

//stack [times=1] [direction=^] [offset]

duplicates the selected region a number of times, each time offset by its width in the given direction.

optionally, you can supply an additional coords offset to be added each iteration. for example,

//stack 10 ^ ^,^-1,^

this command generates a downward staircase made of the selected blocks.